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J. Irwin, M. L. M. Collins, N. Kallivayalil, N. Martin, P. Guhathakurta, R. Ibata, R. M. Rich, R. P. van der Marel, S. R. Majewski, S. T. Sohn, T. K. Fritz, T. M. Brown","submitted_at":"2023-05-22T18:00:02Z","abstract_excerpt":"We present the lifetime star formation histories (SFHs) for six ultra-faint dwarf (UFD; $M_V>-7.0$, $ 4.9<\\log_{10}({M_*(z=0)}/{M_{\\odot}})<5.5$) satellite galaxies of M31 based on deep color-magnitude diagrams constructed from \\textit{Hubble Space Telescope} imaging. These are the first SFHs obtained from the oldest main sequence turn-off of UFDs outside the halo of the Milky Way (MW). We find that five UFDs formed at least 50\\% of their stellar mass by $z=5$ (12.6~Gyr ago), similar to known UFDs around the MW, but that 10-40\\% of their stellar mass formed at later times. 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